Isotopic paleoecology (δ13C, δ18O) of late Quaternary herbivorous mammal assemblages from southwestern Amazon

摘要: Abstract We report the first radiocarbon datings and carbon (δ13C) oxygen (δ18O) stable isotopes data to reconstruct paleoecology of medium large herbivorous mammals from late Quaternary southwestern Amazon (Acre Rondonia states, Brazil). AMS 14C dates for Neochoerus sp. (29,072 - 27,713 Cal yr BP), Notiomastodon platensis (25,454 24,884 BP) Eremotherium laurillardi (11,320 11,131 support Lujanian ages. All fossils have low δ13C δ18O isotopic values that suggest C3-dominated environments closed canopy forests wooded savannas, agreeing with paleovegetation reconstitution. Most species were browsers (piC3=100%; Niche breadth, BA=0), where key largest body mass, N. platensis (∼6,300 kg) E. laurillardi (∼3,500 kg), possibly had a more generalized browser diet in closed-canopies woodlands. Their distinguished C3/C4 generalist Trigodonops lopesi (∼1,900 kg), which foraged savannas (piC3=70%; BA=0.72), similarly its relative Toxodon (∼1,800 kg) browse-dominated mixed feeder (piC3 ≥ 84%, BA ≤ 0.38) Peruvian Bolivian localities. Palaeolama major (∼280 kg) was strictly folivorous within forest canopies, whereas Tapirus (∼250 kg) Mazama (∼40 kg) Holmesina rondoniensis (∼120 kg) but not restricted, could also feed on herbaceous understories woodlands, (∼200 kg) feeding predominantly plants (piC3=∼69%; BA=0.75). estimate interspecific competition been avoid by different strategies, although investigations are still needed better understand their ecological interactions habitats during Quaternary.